Two step knife sharpener



FIG. 1 is a front perspective view of the ornamental design for two step knife sharpener of the invention;

FIG. 2 is a right end elevational view, viewing FIG. 1, of the ornamental design for two step knife sharpener of FIG. 1;

FIG. 3 is a front plan view of the ornamental design for two step knife sharpener of FIG. 1;

FIG. 4 is a rear elevational view, of the ornamental design for two step knife sharpener of FIG. 1;

FIG. 5 is a left end elevational view, viewing FIG. 1, of the ornamental design for two step knife sharpener FIG. 1;

FIG. 6 is a top plan view of the ornamental design for two step knife sharpener of FIG. 1; and,

FIG. 7 is a bottom plan view of the ornamental design for two step knife sharpener of FIG. 1. 

The ornamental design for the two step knife sharpener, as shown and described. 